CN204068875U - based on the multi-channel digital audio amplifier of FPGA - Google Patents
based on the multi-channel digital audio amplifier of FPGA Download PDFInfo
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- CN204068875U CN204068875U CN201420536828.4U CN201420536828U CN204068875U CN 204068875 U CN204068875 U CN 204068875U CN 201420536828 U CN201420536828 U CN 201420536828U CN 204068875 U CN204068875 U CN 204068875U
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Abstract
The utility model proposes a kind of multi-channel digital audio amplifier based on FPGA, comprise input circuit, digital audio processing circuit, control circuit and several output circuits, input circuit comprises several digital input circuits and several analog input circuits, digital audio processing circuit comprises input interface circuit, FPGA digital processing circuit, output interface circuit and PWM circuit, output circuit comprises the digital amplifying circuit be electrically connected successively, output filter circuit and loud speaker, digital input circuit is electrically connected with input interface circuit, analog input circuit is electrically connected with input interface circuit by ADC transducer, FPGA digital processing circuit respectively with input interface circuit, output interface circuit is electrically connected, output interface circuit is electrically connected with PWM circuit, digital audio processing circuit, PWM circuit, numeral amplifying circuit is all electrically connected with control circuit.The utility model can realize multichannel audio data digital processing, transmission, control and share, and effectively can improve sound quality digital audio.
Description
Technical field
The utility model relates to Audiotechnica field, refers in particular to a kind of multi-channel digital audio amplifier based on FPGA.
Background technology
Along with the development of modern microelectronic technology and digitizing technique, digital integrated circuit technology achieves unprecedented progress, along with the development and application of the integrated circuit of digitizing technique and digitized processing, the multimedia terminal equipment of various digital audio technology has incorporated the every aspect of people's life.And as one of application topmost in home entertainment system: audio-frequency power amplifier, also rests on mostly based in the technical scheme of traditional category-A, category-B, AB analoglike audio signal amplifier.Although it is also proposed many new methods in recent years in digitlization, also achieving fast-developing and improving in digitizing technique, mainly concentrates on single amplifier processing method or signal transacting scheme.Be badly in need of wanting one can realize the digital audio amplification system of (Multi-Source Multi-room) between multiple source of sound multichannel in the real daily life application of people, namely can realize the real-time process of multiple audio signal data, share and realize the integrated control in multiple range of sound.Adopt classical signal allocation process method, its circuit composition is very complicated, distortion in signal processing and noise also can increase with circuit complexity and increase, and digital signal processing method will have a lot of advantage than the method for simulation process, therefore how to realize the digitized processing of high-quality audio-frequency signal between multiple source of sound, distribute share and directly realize digital signal amplify become a major issue.
Utility model content
Being difficult to realize the digitized processing of high-quality audio-frequency signal between multiple source of sound in order to solve prior art, distributing the problem shared and directly realize digital signal and amplify, the utility model proposes a kind of multi-channel digital audio amplifier based on FPGA, realize multichannel audio data transmission and the control of digital audio frequency power amplifier, the music distortion of playing is little, noise is low, dynamic range is large, greatly raises the efficiency and energy consumption is low.
The technical scheme that the utility model adopts is: a kind of multi-channel digital audio amplifier based on FPGA, comprises digital audio processing circuit, control circuit, remote input circuit, described digital audio processing circuit comprises several digital input circuits, input interface circuit, several analog input circuits, several adc circuits, FPGA digital processing circuit, output interface circuit, PWM circuit and some roads output circuit, described output circuit comprises the digital amplifying circuit be electrically connected successively, output filter circuit and loud speaker, analog input circuit and adc circuit mate in pairs and are electrically connected, FPGA digital processing circuit by input interface circuit respectively with digital input circuit, adc circuit is electrically connected, and described remote input circuit comprises remote driver circuit and the bluetooth input circuit of electrical connection, and adc circuit is electrically connected with bluetooth input circuit by remote driver circuit, described digital audio processing circuit, output interface circuit, PWM circuit, numeral amplifying circuit is all electrically connected with control circuit.
The utility model utilizes digital signal theory and FPGA Digital Signal Processing, realize the digital audio and video signals process of multiple sound resource, multi-channel sound source data is by FPGA Digital Signal Processing, digital audio is interference-free, without cross-talk etc., ensure audio quality, realize multichannel audio data transmission and the control of digital power amplifier, improve the scope of application of music playing system, practical; The audio signal of digital power amplification circuit to transmission is adopted to carry out amplification process, voice data after FPGA process, be transferred to digital power amplifier module, digital power amplifier module directly carries out amplification process to digital signal, distortion is little, noise is low, dynamic range is large, while tonequality is play in effective raising, also effectively to raise the efficiency and energy consumption is low; Multiple sound resource signal digital/analog input interface, digital to analog converter is provided, compatible multiple types sound source signal, digital signal input directly receives FPGA treatment circuit by I2S interface, and analog signal becomes digital signal to be transferred to FPGA treatment circuit by I2S interface after ADC conversion.
Described input circuit also comprises several bluetooth input circuits, and described bluetooth input circuit is electrically connected with input interface circuit by ADC transducer.
Described control circuit comprises main control module, power management module, and main control module is electrically connected with digital audio processing circuit, PWM circuit by I2C interface circuit, and main control module is electrically connected with digital amplifying circuit by GPIO interface circuit.I2C(Inter-Integrated Circuit) bus is a kind of bus standard that microelectronics Control on Communication field extensively adopts, and has interface line few, control mode is simple, and device package form is little, and traffic rate is advantages of higher comparatively; GPIO interface circuit can provide the control & monitor function of output.
As preferably, described control circuit also comprises remote controllers, and described remote controllers are electrically connected with main control module by UART interface circuit.
Preferred as another, described control circuit also comprises remote controllers, and described remote controllers are connected with main control module wireless telecommunications.
As preferably, described control circuit also comprises LAN interface circuit, and described LAN interface circuit is electrically connected with main control module.The utility model provides lan network interface, and to be connected with master control by LAN circuit and to realize Long-distance Control, lan network interface provides remote control function for user, expands the scope of application of digital power amplifier, and for all types of user, to improve selectivity easy-to-use.
As preferably, described control circuit also comprises memory module, and described storage is electrically connected with main control module.The utility model has memory function.
As preferably, described input interface circuit, output interface circuit are I2S interface circuit.I2S (Inter-IC Sound) bus is a kind of bus standard of the audio data transmission between digital audio-frequency apparatus, specialize in the transfer of data between audio frequency apparatus, adopt the design along independently wire transmission clock and data-signal, by data being separated with clock signal, avoid the distortion brought out because of the time difference.
The beneficial effects of the utility model are: the multichannel audio data transmission and the control that realize digital audio frequency power amplifier, improve the scope of application of music playing system, practical; The music distortion of playing is little, noise is low, dynamic range is large, while effectively improving broadcasting tonequality, also greatly to raise the efficiency and energy consumption is low; Achieve the transmission of data, control and share, expanding the scope of application of music playing system, for all types of user, to improve selectivity easy-to-use; The digital encoding and decoding technique adopted, achieves the total digitalization process from music data source to music playback, realizes audio frequency hi-fi.
Accompanying drawing explanation
Fig. 1 is a kind of circuit structure block diagram of the present utility model.
In figure, 1-input circuit, 2-digital audio processing circuit, 3-control circuit, 4-output circuit, 11-digital input circuit, 12-analog input circuit, 13-bluetooth input circuit, 21-input interface circuit, 22-FPGA digital processing circuit, 23-output interface circuit, 24-PWM modulation circuit, 31-main control module, 32-power management module, 33-I2C interface circuit, 34-GPIO interface circuit, 35-memory module, 36-LAN interface circuit, 37-UART interface circuit, 38-remote controllers, 41-numeral amplifying circuit, 42-output filter circuit, 43-loud speaker.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, a kind of multi-channel digital audio amplifier based on FPGA, comprise input circuit 1, digital audio processing circuit 2, control circuit 3 and 12 output circuits 4, input circuit 1 comprises four digital input circuits 11, four analog input circuits 12 and four bluetooth input circuits 13, digital audio processing circuit 2 comprises input interface circuit 21, FPGA digital processing circuit 22, output interface circuit 23 and PWM circuit 24, output circuit 4 comprises the digital amplifying circuit 41 be electrically connected successively, output filter circuit 42 and loud speaker 43, each digital input circuit 11 is electrically connected with input interface circuit 21, each analog input circuit 12, each bluetooth input circuit 13 is electrically connected with input interface circuit 21 respectively by ADC transducer, FPGA digital processing circuit 22 respectively with input interface circuit 21, output interface circuit 23 is electrically connected, output interface circuit 23 is electrically connected with PWM circuit 24.Input interface circuit 21, output interface circuit 23 are I2S interface circuit.
For the existing audio signal source of compatibility, make the multiple signal sources such as music player such as DVD, MP3 can amplify process and export: outside simulated audio signal converts digital audio and video signals to by analog input circuit 12 and ADC transducer, is transferred to FPGA digital processing circuit 22 carries out data processing by input interface circuit 21; Outside digital audio and video signals is transferred to FPGA digital processing circuit 22 by digital input circuit 11 and carries out data processing; The analog signal of remote input carries out drive amplification by remote analog input circuit and drive circuit, and converts digital audio and video signals to by ADC transducer and be transferred to FPGA digital processing circuit 22 by input interface circuit 21 and carry out data processing; The Bluetooth audio signals of remote input, by bluetooth input circuit 13, by converting digital audio and video signals to by ADC transducer after drive amplification, being transferred to FPGA digital processing circuit 22 by input interface circuit 21 and carrying out data processing.Digital audio-frequency data is transferred to PWM circuit 24 through output interface circuit 23 again after being processed by FPGA digital processing circuit 22 and carries out data processing, digital audio-frequency data after process passes to digital amplifying circuit 41 again, output to loud speaker 43 through output filter circuit 42 filtering high frequency carrier again, realize optimum tonequality and play.
Control circuit 3 comprises main control module 31, power management module 32, memory module 35 and several remote controllers 38, power management module 32 and memory module 35 are electrically connected with main control module 31 respectively, memory module 35 is Flash flash memory module, for storing instant data; Main control module 31 is connected to FPGA digital signal processor 22 and PWM circuit 24 through I2C interface circuit 33, realizes the selection of digital audio and video signals, audio effect processing, transmission and control; Main control module 31 is connected to digital amplifying circuit 41 through GPIO interface circuit 34, and the state realizing amplifying circuit controls; Main control module 31 is connected to internet through LAN interface circuit 36, realizes Long-distance Control; Main control module 31 is connected with outside multiple remote controllers 38 through UART interface circuit 37, realizes control and the communication of multi-channel amplifier.Input circuit 1, digital audio processing circuit 2, control circuit 3 are connected power supply respectively with output circuit 4, and power management module 32 is connected with main control module 31, power electric respectively, power management module 32 detects power status and feeds back to main control module 31, immediately power supply is managed, as charging, power-off etc.
In addition, control circuit 3 can also comprise temperature detecting module, humidity detecting module etc., and temperature detecting module, humidity detecting module are electrically connected with main control module 31 respectively.Temperature detecting module, humidity detecting module can be respectively used to the temperature, the humidity that detect whole circuit environment, allow operator know circuit environmental parameter in time.
Above embodiment is only and technological thought of the present utility model is described; protection range of the present utility model can not be limited with this; every technological thought according to the utility model proposes, any change that technical scheme basis is done, all falls within protection range of the present utility model.
Claims (8)
1. the multi-channel digital audio amplifier based on FPGA, it is characterized in that: comprise input circuit, digital audio processing circuit, control circuit and several output circuits, described input circuit comprises several digital input circuits and several analog input circuits, described digital audio processing circuit comprises input interface circuit, FPGA digital processing circuit, output interface circuit and PWM circuit, described output circuit comprises the digital amplifying circuit be electrically connected successively, output filter circuit and loud speaker, digital input circuit is electrically connected with input interface circuit, analog input circuit is electrically connected with input interface circuit by ADC transducer, FPGA digital processing circuit respectively with input interface circuit, output interface circuit is electrically connected, output interface circuit is electrically connected with PWM circuit, digital audio processing circuit, PWM circuit, numeral amplifying circuit is all electrically connected with control circuit.
2. the multi-channel digital audio amplifier based on FPGA according to claim 1, is characterized in that: described input circuit also comprises several bluetooth input circuits, and described bluetooth input circuit is electrically connected with input interface circuit by ADC transducer.
3. the multi-channel digital audio amplifier based on FPGA according to claim 1, it is characterized in that: described control circuit comprises main control module, power management module, main control module is electrically connected with digital audio processing circuit, PWM circuit by I2C interface circuit, and main control module is electrically connected with digital amplifying circuit by GPIO interface circuit.
4. the multi-channel digital audio amplifier based on FPGA according to claim 3, is characterized in that: described control circuit also comprises remote controllers, and described remote controllers are electrically connected with main control module by UART interface circuit.
5. the multi-channel digital audio amplifier based on FPGA according to claim 3, it is characterized in that: described control circuit also comprises remote controllers, described remote controllers are connected with main control module wireless telecommunications.
6. the multi-channel digital audio amplifier based on FPGA according to claim 3, is characterized in that: described control circuit also comprises LAN interface circuit, and described LAN interface circuit is electrically connected with main control module.
7. the multi-channel digital audio amplifier based on FPGA according to claim 3, it is characterized in that: described control circuit also comprises memory module, described storage is electrically connected with main control module.
8. the multi-channel digital audio amplifier based on FPGA according to claim 1, is characterized in that: described input interface circuit, output interface circuit are I2S interface circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420536828.4U CN204068875U (en) | 2014-09-18 | 2014-09-18 | based on the multi-channel digital audio amplifier of FPGA |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420536828.4U CN204068875U (en) | 2014-09-18 | 2014-09-18 | based on the multi-channel digital audio amplifier of FPGA |
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| CN204068875U true CN204068875U (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420536828.4U Active CN204068875U (en) | 2014-09-18 | 2014-09-18 | based on the multi-channel digital audio amplifier of FPGA |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107371092A (en) * | 2017-07-24 | 2017-11-21 | 北京智能管家科技有限公司 | A kind of microphone array signals processing system and method |
| CN114879931A (en) * | 2022-07-11 | 2022-08-09 | 南京芯驰半导体科技有限公司 | Onboard audio path management method and system supporting multiple operating systems |
-
2014
- 2014-09-18 CN CN201420536828.4U patent/CN204068875U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107371092A (en) * | 2017-07-24 | 2017-11-21 | 北京智能管家科技有限公司 | A kind of microphone array signals processing system and method |
| CN114879931A (en) * | 2022-07-11 | 2022-08-09 | 南京芯驰半导体科技有限公司 | Onboard audio path management method and system supporting multiple operating systems |
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